inheritedProperties

Return an array of an object's inherited property names and symbols.

Usage

var inheritedProperties = require( '@stdlib/utils/inherited-properties' );

inheritedProperties( obj[, level] )

Returns an array of an object's inherited property names and symbols.

var props = inheritedProperties( [ 1, 2, 3 ] );
// returns [...]

By default, the function walks an object's entire prototype chain. To limit the inheritance level, provide a level argument.

var props = inheritedProperties( [ 1, 2, 3 ], 1 );

Examples

var hasSymbolSupport = require( '@stdlib/assert/has-symbol-support' );
var Symbol = require( '@stdlib/symbol/ctor' );
var defineProperty = require( '@stdlib/utils/define-property' );
var inheritedProperties = require( '@stdlib/utils/inherited-properties' );

var hasSymbols = hasSymbolSupport();

function Foo() {
    this.a = 'b';
    defineProperty( this, 'foo', {
        'configurable': false,
        'enumerable': false,
        'writable': false,
        'value': 'bar'
    });
    if ( hasSymbols ) {
        this[ Symbol( 'a' ) ] = 'b';
        defineProperty( this, 'beep', {
            'configurable': false,
            'enumerable': false,
            'writable': false,
            'value': 'boop'
        });
    }
    return this;
}

Foo.prototype.c = 'd';
defineProperty( Foo.prototype, 'bip', {
    'configurable': false,
    'enumerable': false,
    'writable': false,
    'value': 'bap'
});
if ( hasSymbols ) {
    Foo.prototype[ Symbol( 'c' ) ] = 'd';
    defineProperty( Foo.prototype, Symbol( 'e' ), {
        'configurable': false,
        'enumerable': false,
        'writable': false,
        'value': 'f'
    });
}

var obj = new Foo();
var props = inheritedProperties( obj );
// returns [ ..., 'c', 'bip', ... ]